functions: DB -> DB_URL / MQ -> MQ_URL and related docs (#258)

docs/kubernetes/kubernetes-production/functions-config.yaml

@@ -3,5 +3,5 @@ apiVersion: v1
 metadata:
   name: functions-config
 data:
-  MQ: redis://redis-master.default
-  DB: postgres://postgres:mysecretpassword@postgresql-master.default/?sslmode=disable
+  MQ_URL: redis://redis-master.default
+  DB_URL: postgres://postgres:mysecretpassword@postgresql-master.default/?sslmode=disable

docs/kubernetes/kubernetes-production/functions-deployment.yaml

@@ -20,16 +20,16 @@ spec:
         env:
         - name: DOCKER_HOST
           value: unix:///var/run/docker.sock
-        - name: MQ
+        - name: MQ_URL
           valueFrom:
             configMapKeyRef:
               name: functions-config
-              key: MQ
-        - name: DB
+              key: MQ_URL
+        - name: DB_URL
           valueFrom:
             configMapKeyRef:
               name: functions-config
-              key: DB
+              key: DB_URL
         volumeMounts:
         - mountPath: "/var/run/docker.sock"
           name: docker-socket